Microstructure of Ti-Cu alloying layer on Ti6Al4V titanium alloy surface prepared by laser alloying

doi:10.13251/j.issn.0254-6051.2022.07.041

Abstract

Abstract: A continuous and compact Ti-Cu alloying layer with thickness of about 120 μm was prepared on Ti6Al4V alloy surface by laser alloying. The element distribution and microstructure of the Ti-Cu alloying layer were analyzed. The results show that the distribution of Cu element in the Ti-Cu alloying layer is gradient with the depth. Microstructure near the surface of the Ti-Cu alloying layer is mainly composed of columnar crystals with a small amount of block crystals, the upper middle region is mainly composed of undeveloped dendritic crystals and some cellular crystals with different growth orientations, the lower middle region is mainly cellular crystals with different growth orientations, and the interface between the layer and the substrate is mainly composed of fine planar crystals. The Cu and Ti elements in the Ti-Cu alloying layer not only form solid solutions, but also form intermetallic compounds Ti₂Cu, Ti₃Cu, Cu₃Al₄, and metal-ceramic Cu₃TiO₄, Al₂TiO₅.

Key words: Ti6Al4V titanium alloy, laser alloying, Ti-Cu alloying layer, microstructure

CLC Number:

TG166.5

Xie Yanxiang, Li Lin, Ye Fangxia, Fu Fuxing, Li Lei, He Binfeng, Liu Mingxia. Microstructure of Ti-Cu alloying layer on Ti6Al4V titanium alloy surface prepared by laser alloying[J]. Heat Treatment of Metals, 2022, 47(7): 241-244.

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